threading.create_thread does not exist but threading.createThread does. This is inconsistent with Cpython.
Reproduce:
import threading
threading.create_thread()
Attribute Error: 'module' object has no attribute 'create_thread'

Thanks for the bug report, however: threading.current_thread was added after version CPython 2.5 so it should not go in Jython 2.5 - we already have it in the default branch, which will become Jython 2.7 so you will get it then :)